From ed17353d05d6164b5822984b0f5f0639a0359334 Mon Sep 17 00:00:00 2001
From: Andrey Prokhorov <prox@noreply.vacc-ua.org>
Date: Wed, 28 Aug 2019 16:12:38 +0300
Subject: [PATCH] Add 'sba.py'

---
 sba.py | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 sba.py

diff --git a/sba.py b/sba.py
new file mode 100644
index 0000000..fb82db2
--- /dev/null
+++ b/sba.py
@@ -0,0 +1,51 @@
+import sys
+
+class SBA:
+    slots = ('_arr', '_size', '_memsize')
+
+    def __init__(self, size):
+        if not isinstance(size, int):
+            raise ValueError("Size should be integer!")
+        self._arr = 1<<size
+        self._size = size
+        self._memsize = f"{round(sys.getsizeof(self._arr) / 1024, 2)} KByte"
+
+    @property
+    def memsize(self):
+        return self._memsize
+    
+    def __getitem__(self, sliced):
+        if not isinstance(sliced, int):
+            raise ValueError("Only integers accepted as position!")
+        if sliced >= self._size:
+            raise ValueError("Range out of boundaries!")
+        if (self._arr & 1<<sliced) > 0:
+            return 1
+        return 0
+
+    def __setitem__(self, sliced, val):
+        if not isinstance(sliced, int):
+            raise ValueError("Only integers accepted as position!")
+        if not isinstance(val, (int, bool)):
+            raise ValueError("Values accepted as int or bool")
+        if sliced >= self._size:
+            raise ValueError("Range out of boundaries!")
+
+        if isinstance(val, bool):
+            v = {True: 1, False: 0}[val]
+        else:
+            if 0 > val > 1:
+                raise ValueError("Value is out of range!")
+            v = val
+        self._arr = self._arr | v<<sliced
+
+    def __len__(self):
+        return self._size
+
+if __name__ == "__main__":
+    s = SBA(16)
+    print(s[1])
+    s[1] = 1
+    print(s[1])
+    print(len(s))
+    print(s[16])
\ No newline at end of file